JPH0126243B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of terminal processing a cable to be connected to a connector, and is particularly useful for connecting to a connector in a place where the cable wiring space is extremely narrow, such as inside a reactor vessel pedestal. This invention relates to a molded terminal processing method for cables.

FIG. 1 shows the wiring state of a PIP cable whose terminal was processed by a conventional cable terminal processing device and the wiring state of a PIP cable whose terminal was processed by the cable mold type terminal processing method of the present invention. , shows the situation inside the reactor vessel pedestal where those PIP cables are routed, but first, let's look at the situation inside the reactor vessel pedestal where the PIP cables are routed and the conventional cable terminal processing equipment. We will now explain the wiring status of a PIP cable that has been terminal-treated.

As shown in Figure 1, a housing 1 of a control rod drive device (hereinafter referred to as CRD) is attached to the lower part of the pedestal of the reactor vessel (hereinafter referred to as RPV), and the control rods are installed inside this CRD housing 1. A position detection device (hereinafter referred to as PIP) is housed.

In addition, a PIP housing 2 is connected to the lower end of the CRD housing 1, and this PIP housing 2
The PIP main body side connector 3 is attached to the bottom surface of the .

In a nuclear power plant with a generating capacity of 800,000 KW, 87 CRD housings 1 are installed, and a PIP is housed in each CRD housing 1.

Further, directly below the CRD housing 1, in order to prevent the CRD housing 1 from falling, a CRD housing support bar 4 and a CRD housing support grid 5 are combined in a grid pattern and attached to a hanger rod 6 suspended from the top of the RPV pedestal.
It is attached with CRD housing support bar fixing nut 7.

In addition, a CRD automatic exchange machine (not shown) is installed inside the RPV pedestal, and the above hanger rod 6
Below the lower end of the RPV pedestal, almost the entire area within the RPV pedestal is the range of movement of the CRD automatic switch.

Therefore, the PIP cable 8 connected to the PIP main body side connector 3 attached to the bottom surface of the PIP housing 2 should be
It is wired by pulling it upwards.

Since the PIP main body side connector 3 is installed facing downward and there is not much distance between the PIP main body side connector 3 and the upper end of the automatic exchange moving range, conventionally the PIP main body side connector 3 is connected to the PIP main body side connector 3.
By attaching the elbow extension 9 to the PIP cable side connector, the PIP cable 8
The wiring direction was changed to upward.

However, since the elbow-type extension 9 used to bend the PIP cable 8 upward requires a large bending radius, it must be crossed with the CRD housing support grid 5 below and pulled out upwards. I had to.

Also, in order to replace CRD housing 1,
It is necessary to remove the CRD housing support grid 5, but since the CRD housing support grid 5 is combined with the CRD housing support bar 4 in a grid pattern, in order to remove the CRD housing support grid 5, it is necessary to remove the CRD housing support grid 5. It is necessary to loosen all the fixing nuts 7 and lower the whole assembly with the CRD housing support bar 4 combined in a lattice shape.At this time, the PIP cables 8 will interfere, so connect each PIP main body side connector 3 to each After removing all the PIP cable side connectors and lowering the entire grid downwards, it is necessary to reattach the PIP cable side connectors to the PIP main body side connector 3, which takes a lot of work time and reduces the radiation exposure of workers. From this point of view, there were disadvantages that were undesirable.

Another drawback was that the position of the control rods could not be continuously monitored because all the PIP cable side connectors were removed once.

SUMMARY OF THE INVENTION An object of the present invention is to provide a molded cable termination method that eliminates the above-mentioned drawbacks.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 2, reference numeral 10 is a PIP cable side connector, and this PIP cable side connector 10
A cylindrical extension 12 is connected to the cylindrical extension 12 by an upper coupling nut 11. The connection direction of the PIP cable side connector 10 can be changed arbitrarily by the upper coupling nut 11.

The extension 12 is also connected to the cable sleeve 1 by means of a lower coupling nut 13.
4 is connected. By means of the lower coupling nut 13, the connection direction of the PIP cable 8 to which the cable sleeve 14 is connected can be arbitrarily changed.

The end treatment of the PIP cable 8 is to connect the PIP cable 8 to the cable sleeve 14 in a U-shape.
6 into a PIP cable 8.

That is, as shown in FIG. 4, the cable mold type terminal processing method according to the present invention first peels off a predetermined length of the sheath 17 on one end side of the PIP cable 8 to expose the cable shielding layer 18, and then peels off the cable shielding layer 18 at the tip end. The cable shielding device 18 is peeled off at a portion to expose the cable core wire 19.

Next, the portion of the PIP cable 8 where the cable shielding layer 18 is exposed is deformed into a U-shape with a small radius of curvature, and the cable sleeve 14 and the lower coupling nut 13 are removed from the tip of the cable core wire 19 so that the cable shielding layer 18 is exposed. Insert up to the part where it is.
In this state, the cable shielding layer 18 of the PIP cable 8
around the exposed part, cable sleeve 1
4 and a part of the sheath 17 to form a molded layer 16 by adhering a mold made of silicone rubber or the like.
will be established.

The cable sleeve 14 inserted up to the cable shielding layer 18 by the cable sleeve molding layer part 16b adhered to a part of the cable sleeve 14 of the molding layer 16 is connected to the PIP cable 8.
The cable sheath molding layer part 16 is integrally fixed to the cable sheath molding layer part 16 and is kept airtight with the outside, and is adhered to a part of the sheath 17 of the molding layer 16.
Airtightness from the outside is maintained by b.

The exposed portion of the cable shielding layer 18 of the PIP cable 8 is formed into a U-shape with a small radius of curvature by the molded layer 16, and the cable sleeve 14 is integrally fixed to one end of the PIP cable 8. A lower coupling nut 13 is attached to the lower coupling nut 13. One end of the extension 12 is fixed to the lower coupling nut 13. The cable shielding layer 18 of the PIP cable 8 is the cable sleeve 1
4, and the cable core wire 19 is connected to the PIP cable side connector 10 with sufficient extra length within the extension 12. Thereafter, the PIP cable side connector 10 and the other end of the extension 12 are connected by the upper coupling nut 11.

The PIP cable side connector 10 is then connected to the PIP cable 8 which has been terminal-treated by the cable mold-type terminal processing method according to the present invention.
A PIP cable side connector 10 connected to the PIP cable 8 is provided at the lower end of the PIP housing 2.
It is used by being connected to the connector 3 on the PIP main body side.

Such a PIP cable 8 has a molded layer 1
6, it is formed into a small radius of curvature and can be drawn upward, so that it can be drawn upward within one lattice consisting of the CRD housing support bar 4 and the CRD housing support grid 5, as shown in FIG. It is pulled out and wired.

Therefore, since there is no intersection between the PIP cable 8 and the CRD housing support grid 5, the CRD housing support grid 5 can be attached and removed without removing the PIP cable side connector 10 from the PIP main body side connector 3.

The cable mold terminal processing method of the present invention involves peeling off a predetermined length of the sheath at one end of the cable to expose the cable shielding layer, deforming the exposed cable shielding layer into a U-shape with a small radius of curvature, and A sleeve is sheathed to cover the cable shielding layer from the exposed end of the cable shielding layer, and then a mold is attached around the exposed cable shielding layer, a part of the cable sleeve, and a part of the sheath to integrally join the cable sleeve. A U-shaped molding layer is molded, and a coupling nut for connecting a cable connector is molded into a U-shaped molding layer.
Since the cable is fixed to the cable sleeve that is bonded to the cable sleeve that is bonded to the cable core layer, the cable can be made with a much smaller radius of curvature than before by simply attaching the mold to the peeled cable core and providing a mold layer. Moreover, by adjusting the thickness of the molded layer, the portion of the cable having the molded layer can be easily made to have an appropriate and sufficient strength.

In addition, the cable sleeve is integrated with the cable core, and a molded layer is provided on the cable core on a part of the cable sleeve in addition to the cable core to ensure airtightness from the outside between the cable core and sheath and between the cable core and the cable sleeve. It is said that it is possible to improve work efficiency since it is sometimes provided.

A cable that has been terminated by the molded cable termination method of the present invention is PIPed.
When used as a cable, there is no need to remove the PIP connector when replacing the CRD automatic exchanger, which greatly reduces the time required to replace the CRD housing in the CRD automatic exchanger and reduces radiation exposure for workers. , it also has the effect of making it possible to continuously monitor the control rod position.

Furthermore, since there is no need to remove the PIP connector, reliability is maintained by reducing the number of times the connector is connected and disconnected, and the wiring space for the PIP cable is reduced so that it does not interfere with work inside the RPV pedestal. It is also effective.

[Brief explanation of drawings]

Figure 1 shows the wiring state of a PIP cable whose terminal was processed by a conventional cable terminal processing device, the wiring state of a PIP cable whose terminal was processed by the cable mold type terminal processing method of the present invention, and their wiring states. FIG. 2 is a perspective view showing the inside of the reactor vessel pedestal where the cables are wired; FIG. FIG. 4 is a bottom view of a PIP cable whose terminals have been processed by the molded cable terminal processing method, and FIG. 4 is a vertical cross-sectional view of the PIP cable whose terminals have been processed by the molded cable terminal processing method. 8...PIP cable, 10...PIP cable side connector, 11...Upper coupling nut, 1
2... Extension, 14... Cable sleeve, 15... Reinforcement rib, 16... Molding layer, 17... Sheath, 18... Cable shielding layer,
19...Cable core wire.

Claims (1)

[Claims] 1 Peel off a predetermined length of the sheath at one end of the cable to expose the cable shielding layer, deform the exposed cable shielding layer into a U-shape with a small radius of curvature, and insert the cable sleeve from the exposed cable shielding layer end to expose the cable shielding layer. sheathing the shielding layer, then adhering a mold around the exposed cable shielding layer, a part of the cable sleeve, and a part of the sheath to form a U-shaped molding layer integrally connected to the cable sleeve; U the coupling nut for connecting the cable connector.
1. A molded termination method for a cable, characterized in that the cable is fixed to a cable sleeve bonded to a letter-shaped molding layer.